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Related Experiment Videos

P3 latency and symbol digit performance correlations in aging.

R Y Emmerson1, R E Dustman, D E Shearer

  • 1Neuropsychology Laboratory, Veterans Administration Medical Center, Salt Lake City, Utah 84148.

Experimental Aging Research
|January 1, 1989
PubMed
Summary

Physical fitness influences cognitive aging. High fitness levels mitigate age-related declines in P3 latency and Symbol Digit Modalities Test (SDMT) performance, suggesting preserved central nervous system function.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Gerontology

Background:

  • Aging is associated with changes in cognitive function and electrophysiological measures.
  • Physical fitness is increasingly recognized as a factor influencing cognitive health in older adults.
  • The P3 latency, an event-related potential, and the Symbol Digit Modalities Test (SDMT) are sensitive to cognitive changes.

Purpose of the Study:

  • To investigate the relationships between age, P3 latency, and SDMT performance.
  • To examine the moderating role of physical fitness on these age-related cognitive and electrophysiological changes.
  • To determine if the relationship between P3 latency and SDMT performance is independent of age.

Main Methods:

  • Investigated 172 subjects aged 20-79 years.

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  • Measured P3 latency and Symbol Digit Modalities Test (SDMT) performance.
  • Analyzed data using correlation and partial correlation, stratifying by age and physical fitness levels.

    • Main Results:

    • Age-related increases in P3 latency were more pronounced in older adults (>55 years) with low physical fitness.
    • Similar age-related declines were observed in SDMT performance, particularly in lower fitness groups.
    • P3 latency and SDMT performance were significantly correlated in older, low-fitness subjects, independent of age.

    Conclusions:

    • P3 latency is a sensitive indicator of age- and health-related changes in central nervous system function and cognitive performance.
    • Physical fitness plays a crucial role in mitigating age-related cognitive and electrophysiological declines.
    • Clinical application of P3 latency requires consideration of nonpathological variables like physical fitness and age-adjusted norms.